| http://www.w3.org/ns/prov#value | - The directional control caster assembly of claim 1 wherein the caster is a lockable and rotatable caster, the caster support and caster wheel being rotatable relative to the mounting shaft when the engagement portion of the locking washer is in engagement with the blocking surface on the mounting shaft, the caster including a locking mechanism connected to the caster support, the locking mechanism
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